The LED Changer is a light source that contains 10 high power LEDs placed on a revolving disc. Only one of the LEDs can be turned on at the time.
LED selection, light intensity, duration and other parameters are driven from a program on a PC.
The device has a cage (Thorlabs or TECHSPEC from Edmund Optics compatible) type of sample holder with a manually adjustable lens that is used to focus light on a sample or on a waveguide.
The LED Changer can be used wherever a strong LED light is needed.
The LED disc that contains 10 single structure LEDs is exchangeable. One can order a disc with custom LEDs from the list below.
The LED Changer can be oriented in several ways depending on the application. It can also be mounted on an optical stand.
Forms Photoelectrochemical (PEC) Measurement Station, when coupled with the Potentiostat. The LED Changer is often used as a light source in Surface Photovoltage Spectroscopy (SPS) with our Kelvin Probe. The LED Changer attached to the Electrochemical Shielding Box illuminates a sample which is screened out from unwanted light sources and other electromagnetic noise.
- Spectral range: 280 nm – 1000 nm (depends on selection of LEDs)
- Lens focal length: 25 mm
- Number of LEDs per disc: 10
- Disc rotation: automatized
- Light beam focus: manual
- Can be combined with Potentiostat, Kelvin Probe, and more.
- Light intensity adjustment: from PC
- LED positioning on optical axis: automatized
- Light on/off duration: from PC
- PC connectivity: USB 2.0
- Power supply: 230 V, 50 Hz or 115 V, 60 Hz.
- Dimensions: 121 x 112 x 132 mm (l x w x h)
Other features:
- auto close in – automatic turn off after a defined time, in [s]
- use ramp – smooth light intensity increase after turning on, smooth decrease after turning off, transition time set in [s]
- modulation – intensity modulation of a frequency given in [Hz], or a period in [s], with a given amplitude ‘Amp [%]’ and ‘Bias [%]’
LED selection list
| Nr | Mean waveleght [nm] | Width [nm] | Max current [mA] | Max light power [mW] |
|---|---|---|---|---|
| 1 | 340-350 | 10.0 | 500 | ? |
| 2 | 360-370 | 9.7 | 500 | 76.5 |
| 3 | 385-395 | 12.6 | 500 | 76.8 |
| 4 | 400-410 | 13 | 700 | 100.09 |
| 5 | 420-430 | 19 | 700 | 64.0 |
| 6 | 450-460 | 18 | 700 | 92.00 |
| 7 | 520-530 | 28.5 | 700 | 33.50 |
| 8 | 590-600 | 14.7 | 700 | 29.50 |
| 9 | 630-640 | 15.3 | 700 | 44.50 |
| 10 | 730-740 | 18.7 | 700 | 46.40 |
| 11 | 850-860 | 16.6 | 700 | 44.60 |
| 12 | white (420-700) | 280 | 700 | 60 |